A researcher investigated the impact of reading medium on comprehension. They tested 30 participants reading from a printed book in a quiet, secluded study room, and then tested the exact same 30 participants reading from an e-reader in a busy, noisy open-plan library.
Suggest one way in which the researcher could modify this study to improve its internal validity. Justify your answer.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.